Tips about the position of subwoofer: Usually only in the 0°position,If you can’t hear or the bass is very weak,please change it to the 108°position,and confirm the connection status of “+ -”. Nobsound Lepy 168plus Stereo Audio Amplifier Mini 2 1 Channel 80 W 68 W Hi Fi Stereo Usb Sd Bluetooth Aux Rca Audio Digital Power Amplifier Subwoofer Amp Bass Car Vehicle Home Booster Remote Control Led Display Screen Whether you're looking to enhance your home audio setup or boost the sound in your car, the Nobsound Lepy 168Plus is the ideal choice for audiophiles who demand quality and convenience. Audio Input: USB, Bluetooth, AUX, RCA, Package Includes: 1 * Amplifier Wireless Connectivity: Easily pair with Bluetooth devices (like phone/PC/iPad); an external antenna ensures a robust signal for seamless music streaming. 1 * Remote control(without battery), 1 * 12V/5A Adapter, 1 * English user manual Control the amplifier effortlessly with the included mini remote controller, allowing you to make adjustments without having to leave your seat. Power: 45Wx2 & 68Wx1, Color: Black Specifications: Casing Material: lightweight aluminum, Size: 17., 6*15., 5*4., 3 cm Upgrade your audio experience with the Nobsound Lepy 168Plus Mini 2.1 Channel Hi-Fi Stereo Power Amplifier, designed to deliver rich, powerful sound with ease Versatile Inputs: Features AUX, Dual RCA, and USB inputs, compatible with a wide range of audio sources including MP3, MP4, PC, DVD, CD, and VCD players etc It also has separate bass, treble and volume control knobs. Lepy Audio Amplifier Mini HiFi Stereo Treble Bass Booster - AK-270 Frequency response: 20Hz-20KHz, Speaker Impedance: 4-8Ω Versatile Inputs: Features AUX, Dual RCA, and USB inputs, compatible with a wide range of audio sources including MP3, MP4, PC, DVD, CD, and VCD players etc.